More Yeah More

Don't ice your knees. Apply heat. Ice prevents swelling. There's nothing in your knees to swell, only ligaments and tendons. Heat will keep them loose.

This one I'm not completely sure of: Don't ice a sprained ankle unless you gotta play the next game. Swelling is caused by blood flow to an injured area. Blood supplies the gunk that fixed the ouchie. If you prevent swelling you prevent the body's natural healing process, turning a minor sprained ankle into a season long problem.